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Infrared thermal radiation
Infrared thermal radiation is electromag-
netic radiation emitted by every body above
0 Kelvin (−273°C). The amount of radiation
depends on the temperature and the emis-
sivity of the body.
Emissivity
The emissivity of an object depends on the
material and the structure of its surface. This
specifies how much infrared thermal radia-
tion the object emits compared with an ideal
radiant warmer (black body, emissivity ε =
1) and accordingly has a value between 0
and 1.
Glossary of Terms
Thermal bridge
A thermal bridge is defined as a position on
the external wall of a building, where there
is a localized increase in heat loss due to a
structural defect.
Thermal bridges can lead to an increased
risk of mold.
Reflected temperature/reflectivity
of an object
The reflected temperature is the thermal
radiation that is not emitted by the object
itself. Depending on the structure and mate-
rial, background radiation is reflected in the
object to be measured, therefore distorting
the actual temperature result.
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